Pound Sign

The pound sign will appear as # in Latin script and indicates that what follows is should be read as a number in some series.

May also be referred to as a hash especially in computing circles or outside of North America or number sign.

Referring to a pound sign as a hashtag will probably, rightly or wrongly (but probably rightly) give cause for adults to think you are a child.

To access your bank account, please press the pound sign, followed by your PIN number.

Pound Sign by Stormin'Norman June 14, 2013

Pound sign

A tattoo on the lower back of a female. Generally some kind of tribal tatt, seen on the wall of a tattoo shop, or a butterfly, dolphin, or sun burst. Usually seen just above the thong line, to draw attention to it.

Damn bro, did you see that pound sign on that chick at the club last night?!

Pound sign by Rooster2188 January 8, 2010

Poundsigning 

Another way of saying hashtagging since a hashtag and pound sign is basically the same thing

Well i went on Twitter the other day and saw more than 500 people poundsigning #solveworldhunger.

Poundsigning by Chase Farnham September 9, 2014